DE102013008955A1 - Actuation device for motion-operated devices in motor vehicles with only a single switching valve - Google Patents

Abstract

The invention relates to an actuating device for movement-actuated devices in motor vehicles such as motor vehicle transmissions or motor vehicle clutches, containing at least one fluid-actuated, double-acting actuating cylinder (1) with two cylinder chambers (5, 6) separated from one another by an actuating piston (3) for executing movements of the actuating pistons (3) in two opposite directions and with a valve device (7) for controlling the fluid inlet and the fluid outlet for the cylinder chambers (5, 6). The invention provides that a) the actuating piston (3) of the at least one actuating cylinder (2) has two active surfaces (A1, A2), of which a first active surface (A1) has a first cylinder chamber (5) and a second active surface (A2) a second cylinder chamber (6) delimits and the second effective area (A2) is larger than the first effective area (A1), b) the first cylinder chamber (5) is always connected to a fluid source (8), and c) the valve device (7) ) for each adjusting cylinder (1) comprises a 3/2-way valve as the only switching valve, which in a first switching position connects the fluid source (8) with the second cylinder chamber (6) and in a second switching position the second cylinder chamber (6) with a pressure sink .

Description

The invention relates to an adjusting device for movement-actuated devices in motor vehicles such as motor vehicle transmissions or motor vehicle clutches, comprising at least one fluid-operated, double-acting actuating cylinder with two cylinder chambers separated from each other by an actuating piston for carrying out movements of the actuating piston in two mutually opposite directions, as well as with a valve device for controlling the fluid inlet and the fluid drain for the cylinder chambers according to the preamble of claim 1 and a method for controlling the actuator according to the preamble of claim 6.

Such actuators are used, for example, as an actuator for automated transmissions or clutches of motor vehicles. In commercial vehicles, where already a compressed air system for the commonly used air brakes or air suspension is available, such actuators are electro-pneumatic, is used as the working fluid compressed air.

Such an adjusting device is for example from the DE 10 2006 030 034 A1 known. The adjusting device has per cylinder chamber of the double-acting actuating cylinder per a 3/2-way switching valve and an upstream clocked pressure control valve. The 3/2-way switching valves connect according to a first switching position, the associated cylinder chamber with a fluid source and according to a second switching position with a pressure sink. By means of the upstream clocked pressure control valve, the working pressure is adjusted in the cylinder chambers. Due to the relatively high number of switching valves, however, the cost of the known actuator is relatively high.

Object of the invention

Based on this, the object of the invention is to further develop an adjusting device of the type mentioned in the beginning so that it can be produced less expensively. Furthermore, a method for controlling the adjusting device is to be made available.

This object is solved by the features according to claim 1.

Disclosure of the invention

• a) der Stellkolben des wenigstens einen Stellzylinders zwei Wirkflächen aufweist, von denen eine erste Wirkfläche eine erste Zylinderkammer und eine zweite Wirkfläche eine zweite Zylinderkammer begrenzt und die zweite Wirkfläche größer als die erste Wirkfläche ist,
• b) die erste Zylinderkammer stets mit einer Fluidquelle in Verbindung steht,
• c) die Ventileinrichtung für jeden Stellzylinder als einziges Schaltventil ein 3/2-Wegeventil umfasst, welches in einer ersten Schaltstellung die Fluidquelle mit der zweiten Zylinderkammer und in einer zweiten Schaltstellung die zweite Zylinderkammer mit einer Drucksenke verbindet.

According to the invention it is proposed that

• a) the actuating piston of the at least one adjusting cylinder has two active surfaces, of which a first active surface defines a first cylinder chamber and a second active surface defines a second cylinder chamber and the second effective surface is larger than the first effective surface,
• b) the first cylinder chamber is always in communication with a fluid source,
• c) the valve device for each actuating cylinder as a single switching valve comprises a 3/2-way valve which connects the fluid source with the second cylinder chamber in a first switching position and the second cylinder chamber with a pressure sink in a second switching position.

Thus, a fluid inlet and the fluid outlet for both cylinder chambers of an actuating cylinder with only a single switching valve in the form of a 3/2-way valve. Consequently, only a single switching valve in the form of the 3/2-way valve is interposed between the fluid source, for example in the form of a fluid reservoir and the actuating cylinder. Thus, with the help of the invention, two stable positions of the actuating cylinder allows, with only a single switching valve is necessary or used instead of two switching valves as in the prior art. Therefore, the adjusting device according to the invention is very inexpensive to produce.

According to the method for controlling the adjusting device, the 3/2-way valve is then in a first direction to perform a movement of the actuating piston in the first switching position and to perform a movement of the actuating piston in a direction opposite to the first direction second direction of the 3 / 2- Directional valve transferred to the second switching position.

The measures listed in the dependent claims advantageous refinements and improvements of claim 1 invention are possible.

Particularly preferably, the second effective area of the actuating piston is at least twice as large as the first effective area. Thus, the actuating force in both directions of actuation is approximately equal.

Particularly preferably, the 3/2-way valve is an electrically controlled by an electronic control unit solenoid valve. This can be spring-loaded in one of the switching positions, which results in a reduction of the load and a power saving, because then an energization of the valve in one of the switching positions is not necessary.

Advantageous developments of the invention will become apparent from the claims, the description and the drawings. The advantages of. In the description introduction Features and combinations of several features are merely exemplary and may be used as an alternative or cumulative effect, without the advantages of compelling embodiments of the invention must be achieved.

Further features are the drawings - in particular the illustrated geometries and the relative dimensions of several components to each other and their relative arrangement and operative connection - refer. The combination of features of different embodiments of the invention or of features of different claims is also possible deviating from the chosen relationships of the claims and is hereby stimulated. This also applies to those features which are shown in separate drawings or are mentioned in their description. These features can also be combined with features of different claims. Likewise, in the claims listed features for further embodiments of the invention can be omitted.

drawing

An embodiment of the invention is illustrated in the drawing and explained in more detail in the following description. In the drawing shows

1 a schematic representation of a preferred embodiment of an actuating device according to the invention with a double-acting actuator cylinder;

2 a schematic representation of the adjusting device of 1 with the actuating cylinder in a first stable position;

3 a schematic representation of the adjusting device of 1 with the actuating cylinder in a second stable position;

Description of the embodiment

An adjusting device for a motor vehicle transmission or a motor vehicle clutch of a motor vehicle includes a control cylinder 1 with a housing 2 and an actuator piston 3 with associated piston rod, which relative to the housing 2 is linearly movable. For transmission applications, a transmission shift fork or a gear shift lever and the piston rod 3 a mechanism interposed, which transmits the movement of the piston rod.

An inner wall of the housing 2 and a radially outer edge of the actuating piston 3 or the piston rod are also sealing elements 4 interposed, wherein the actuating piston 3 a first cylinder chamber 5 and a second cylinder chamber 6 separates from each other sealingly. In addition, also guide elements for guiding the actuating piston 3 in the cylinder 2 be provided. Last but not least, a position sensor (not shown here) may also be provided for measuring the relative position of the piston 3 in relation to the housing 2 ,

The actuating piston has two active surfaces A ₁ and A ₂ for the compressed air, of which a first effective area A _1, the first cylinder chamber 5 and a second effective area A _2, the second cylinder chamber 6 limited and the second effective area A _{2 is} greater than the first effective area A ₁ . In the figures, the first effective area A _{1 is} smaller than the second effective area A ₂ , because the second effective area A _{2 is} a continuous surface and the first effective area A ₁ because of the piston rod of the actuating piston 3 a ring surface is. The second effective area A _{2 is} about twice as large as the first effective area A ₁ is preferred.

On the motor vehicle, which is preferably a commercial vehicle with a compressed air system, compressed air is present. Here, a compressor, not shown here generates compressed air for a compressed air supply 8th , The compressed air supply 8th is by means of a compressed air line 10 on the one hand always, ie without the interposition of a switching valve with the first cylinder chamber 5 and on the other hand with a switching valve in the form of a 3/2-way valve 7 connected. It is possible, however, that the pressure in the compressed air line 10 controlling or regulating pressure control valve or a deviating from a switching valve in the compressed air line 10 behind the compressed air supply 8th Is arranged adjusting cylinder side.

Particularly preferably, the 3/2-way valve is an electrically controlled by an electronic control unit solenoid valve, which is spring-loaded in one of its two switching positions de-energized. A first connection of the 3/2-way valve is via a compressed air line 9 with the second cylinder chamber 6 , a second connection to the compressed air line 10 and a third port connected to a pressure sink or vent. The 3/2-way valve then connects in a first, preferably energized switching position the compressed air reservoir 8th with the second cylinder chamber 6 and in a second, in 1 and 2 shown and preferably energized spring-loaded switching position, the second cylinder chamber 6 with the pressure sink or vent.

In 2 is the second de-energized switching position of the 3/2-way valve shown in the second cylinder chamber 6 communicates with the pressure sink or vent. This second switching position is stable, because in the first cylinder chamber 5 the supply pressure of the compressed air supply 8th acting on the first effective area A ₁ and the second cylinder chamber 6 is vented. This creates an in 1 rightward force on the actuator piston 3 , which can then actuate the gearbox via the piston rod accordingly.

3 shows the first energized switching position of the 3/2-way valve, in which both the first cylinder chamber 5 as well as the second cylinder chamber 6 via the compressed air line 10 with the compressed air supply 8th are connected. As the adjusting piston 3 but the second effective area A _{2 is} greater than the first effective area A ₁ , arises at the same pressure p in both cylinder chambers 5 . 6 according to the equation F = p · A at the second effective area A ₂ a larger force F. Particularly preferred is the second effective area A _{2 of} the actuating piston 3 at least twice as large as the first effective area A ₁ . Consequently, then the adjusting piston in 3 shifted to the left to switch the transmission.

To perform a movement of the actuator piston 3 in a first direction is the 3/2-way valve 7 therefore energized and de-energized to carry out a movement of the actuating piston in a direction opposite to the first direction opposite second direction. The piston stroke of the actuating piston 3 can at both ends by appropriate stops on the housing 2 be limited.

LIST OF REFERENCE NUMBERS

1

actuating cylinder

2

casing

3

actuating piston

4

sealing elements

5

first cylinder chamber

6

second cylinder chamber

7

3/2-way valve

8th

Compressed air supply

9

Compressed air line

10

Compressed air line

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102006030034 A1 [0003]

Claims (8)

Actuating device for motion-operated devices in motor vehicles such as motor vehicle transmissions or motor vehicle clutches, comprising at least one fluid-operated, double-acting actuating cylinder ( 1 ) with two by a control piston ( 3 ) separate cylinder chambers ( 5 . 6 ) for carrying out movements of the adjusting piston ( 3 ) in two mutually opposite directions, and with a valve device ( 7 ) for controlling the fluid inlet and the fluid outlet for the cylinder chambers ( 5 . 6 ), characterized in that a) the actuating piston ( 3 ) of the at least one actuating cylinder ( 2 ) has two active surfaces (A ₁ , A ₂ ), of which a first active surface (A ₁ ) a first cylinder chamber ( 5 ) and a second active surface (A ₂ ) a second cylinder chamber ( 6 ) and the second effective area (A ₂ ) is greater than the first effective area (A ₁ ), b) the first cylinder chamber (A ₂ ) 5 ) always with a fluid source ( 8th ), c) the valve device ( 7 ) for each actuator cylinder ( 1 ) comprises as the only switching valve, a 3/2-way valve, which in a first switching position, the fluid source ( 8th ) with the second cylinder chamber ( 6 ) and in a second switching position, the second cylinder chamber ( 6 ) connects to a pressure sink. Adjusting device according to claim 1, characterized in that the second active surface (A ₂ ) of the actuating piston ( 3 ) is at least twice as large as the first effective area (A ₁ ). Adjusting device according to claim 1 or 2, characterized in that the 3/2-way valve is an electrically controlled by an electronic control unit solenoid valve. Adjusting device according to claim 3, characterized in that the 3/2-way valve ( 7 ) is spring loaded in one of the switching positions. Actuating device according to one of the preceding claims, characterized in that the fluid compressed air and the fluid source ( 8th ) is a supply of compressed air. Method for controlling the adjusting device according to one of the preceding claims, characterized in that for carrying out a movement of the adjusting piston ( 3 ) in a first direction the 3/2-way valve ( 7 ) in the first switching position and to perform a movement of the actuating piston ( 3 ) in a counter to the first direction opposite second direction of the 3/2-way valve ( 7 ) is transferred to the second switching position. A movement-actuated device in a motor vehicle such as motor vehicle transmission or motor vehicle clutch actuated by at least one adjusting device according to one of claims 1 to 5. Motor vehicle comprising at least one adjusting device ( 1 ) according to one of claims 1 to 5.

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